On September 8, 2011, ATK fired the last of the Shuttle-scale solid rocket boosters at their Promontory, Utah, test site. The Development Motor-3 test fired a five-segment booster generating 3.6 million pounds of thrust.

On September 8, 2011, ATK fired the last of the Shuttle-scale solid rocket boosters at their Promontory, Utah, test site. The Development Motor-3 test fired a five-segment booster generating 3.6 million pounds of thrust.